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Cheap flights from St. Louis to Sofia from $603

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 4/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:10 pm - 6:05 pm
STL
-
SOF
21h 55m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$829Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
British Airways Logo
9:46 am - 1:25 pm
STL
-
SOF
43h 39m
2 stops
British Airways Logo
9:25 pm - 8:03 pm
SOF
-
STL
30h 38m
2 stops
$836British Airways
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
12:30 pm - 12:10 pm
STL
-
SOF
15h 40m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$838United Airlines
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
8:55 am - 6:05 pm
STL
-
SOF
25h 10m
2 stops
Multiple Airlines Logo
6:10 am - 1:25 pm
SOF
-
STL
15h 15m
2 stops
$845Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
12:30 pm - 12:10 pm
STL
-
SOF
15h 40m
2 stops
United Airlines Logo
6:20 am - 5:49 pm
SOF
-
STL
19h 29m
2 stops
$848United Airlines
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
12:10 pm - 6:05 pm
STL
-
SOF
21h 55m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$849United Airlines
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
12:10 pm - 6:05 pm
STL
-
SOF
21h 55m
2 stops
Multiple Airlines Logo
6:20 am - 9:22 pm
SOF
-
STL
23h 02m
2 stops
$860Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
Air Canada Logo
12:10 pm - 6:05 pm
STL
-
SOF
21h 55m
2 stops
Air Canada Logo
1:50 pm - 6:41 pm
SOF
-
STL
36h 51m
2 stops
$873Air Canada
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
3:30 pm - 6:10 pm
STL
-
SOF
18h 40m
1 stop
Multiple Airlines Logo
6:20 am - 6:41 pm
SOF
-
STL
20h 21m
2 stops
$901Multiple Airlines
Sun, Aug 30 - Wed, Sep 16
Lufthansa Logo
3:30 pm - 6:10 pm
STL
-
SOF
18h 40m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$912Lufthansa
Sun, Aug 30 - Wed, Sep 16

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Sep 9
STL12:30 pmLambert-St Louis
15h 40m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$838
United Airlines
Sep 9
STL12:30 pmLambert-St Louis
15h 40m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:20 amSofia
19h 29m
2 stops
STL5:49 pmLambert-St Louis
$848
United Airlines
Sep 9
STL12:10 pmLambert-St Louis
21h 55m
2 stops
SOF6:05 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$849

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Aug 30
STL3:30 pmLambert-St Louis
18h 40m
1 stop
SOF6:10 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$912
Lufthansa
Sep 9
STL3:30 pmLambert-St Louis
18h 35m
1 stop
SOF6:05 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$1,073
Lufthansa
Sep 9
STL3:30 pmLambert-St Louis
13h 55m
1 stop
SOF1:25 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$1,079

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated April 15, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:10 pm-6:05 pm

2 stops21h 55m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$829

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

9:46 am-1:25 pm

2 stops43h 39m

Sofia

Wed 9/16

9:25 pm-8:03 pm

2 stops30h 38m

$836
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:30 pm-12:10 pm

2 stops15h 40m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$838

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

8:55 am-6:05 pm

2 stops25h 10m

Sofia

Wed 9/16

6:10 am-1:25 pm

2 stops15h 15m

$845

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:30 pm-12:10 pm

2 stops15h 40m

Sofia

Wed 9/16

6:20 am-5:49 pm

2 stops19h 29m

$848

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:10 pm-6:05 pm

2 stops21h 55m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$849

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:10 pm-6:05 pm

2 stops21h 55m

Sofia

Wed 9/16

6:20 am-9:22 pm

2 stops23h 02m

$860

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:10 pm-6:05 pm

2 stops21h 55m

Sofia

Wed 9/16

1:50 pm-6:41 pm

2 stops36h 51m

$873

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/30

3:30 pm-6:10 pm

1 stop18h 40m

Sofia

Wed 9/16

6:20 am-6:41 pm

2 stops20h 21m

$901

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 8/30

3:30 pm-6:10 pm

1 stop18h 40m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$912

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $847 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $746 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 37% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

18h 20m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 18h 20m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 18h 20m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,587 reviews
Search United Airlines flights
LufthansaPriceFrom $598Free CancellationRating
6.8
7,927 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
10,923 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines
Air Canada